BoilerFaultCodesWorcester Bosch F7228 Fault Code
The Worcester Bosch F7228 fault code means: your boiler detects a flame when there shouldn't be one, so it has shut down as a safety precaution to prevent gas from flowing incorrectly.. It appears on 3 Worcester Bosch models in our database.
Technical description: Isioniation current detected before burner start
What causes the Worcester Bosch F7228 fault?
This fault occurs when the boiler's internal sensor detects an electrical signal signifying a flame is present before the ignition process has even started. The most common reasons are a moisture-damaged or soot-covered electrode sending a false signal, or a faulty gas valve that is leaking small amounts of gas into the combustion chamber.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the F7228 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch F7228 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026